There are some bugs currently with the shipping plugin currently for quoting postage costs outside of Australia.
So you can still order, I have entered a default postage value of AU$13 for instances where no postage rate is returned. This seems to be happening for places like Japan and USA, but there may be others.
If this ends up being too much, I will refund you the difference. Or if it is not enough, I will contact you before sending.
It is working fine for orders shipping within Australia.
Sorry for this inconvenience, hopefully it will be fixed soon. Email me at email@example.com with any questions.